Earlier quoted context omitted.
Yes, you can. Please try to make sure the information you write is correct. Quick look at the repository I linked above would have made this clear.
What part of the repository says this? I'm having trouble imaginging how it would work, unless the mainstream IPFS network now supports WebRTC?
Looking at the readme, I noticed our examples our not as featured as I thought so sorry for the harshness. But following the link to the examples, leads to a example called "Tutorial - Transfer files between the browser and other IPFS nodes" which explains how you can connect a js-ipfs node with other nodes, like go-ipfs that runs on desktop. Link: https://github.com/ipfs/js-ipfs/tree/master/examples/exchang...
go-ipfs, which I guess you refer to with the mainstream network, has support for websockets which the browser nodes has support for as well, so they can interop.